Results 211 to 220 of about 432,044 (264)
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Testing the behavior in hostile environment of Points of Load for LHC experiments
Measurement, 2015Abstract Devices used in future experiments at LHC will have to work in a very hostile environment. Power supply is a key aspect in this scenario and new converters must be designed in order to meet the future requirements. This is particularly true for Point of Load (PoL) converters that, being located as close as possible to the loads, must operate
M. Lazzaroni +4 more
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3D Elastic Solutions for Laterally Loaded Discs: Generalised Brazilian and Point Load Tests
Rock Mechanics and Rock Engineering, 2013This paper investigates the application of a double Fourier series technique to the construction of an elastic stress field in a cylindrical bar subject to lateral boundary loads. The lateral loads, including the constant load boundary conditions, are represented by two Fourier series: one on the perimeter of the circular section (r , θ) and the other ...
Serati, Mehdi +2 more
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Point load tests and strength measurements for brittle spheres
International Journal of Rock Mechanics and Mining Sciences, 2009A multiaxial failure criterion for brittle materials is applied to a stress field analysis of a perfectly elastic sphere subjected to diametrically opposite normal forces that are uniformly distributed across small areas on the sphere's surface. Expressions are obtained for an intrinsic strength parameter of the material, as well as its unconfined ...
Russell, A.R., Muir Wood, David
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Study on Rock Strength Characteristic by Point Load Test
Applied Mechanics and Materials, 2014Test point load test requires relatively small load, its instrument is portable, it can be easily applied to on-site testing,which may pave the way for the development of the fieldstrength of rock mechanics test, widely promoted in engineering construction, has a large space for development.
Rui Hong Wang +3 more
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RHRPMPOLS01 Point of Load: Qualification & Radiation Tests
2019 European Space Power Conference (ESPC), 2019This paper provides a detailed overview of the qualification activities including the radiation tests (both TID and SEE) of the RHRPMPOL01 IC device, a radiation hardened 7A synchronous step-down monolithic switching regulator with high precision internal voltage reference and integrated power MOSFETs for synchronous conversion.
Salvatore Pappalardo +5 more
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The Five Point Loading Shear Stiffness Test
The Aeronautical Journal, 1968Howard suggested that the shear stiffness of a beam in bending could be more expeditiously determined by using the five point loading system.Grayley reviewed the accuracy and speed of various methods of finding the shear stiffness of sandwich beams and showed that five point loading compared favourably on all counts with three point loading, four point
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The Point Load Test for the Tensile Strength of Rock
Geotechnical Testing Journal, 1980Abstract The theoretical background is presented for the point load test for determining the tensile strength of rock materials. Theoretical predictions of the dependence of fracture force on sample shape (in this case, spheres and cylinders) are shown to agree quite well with experimental data for Plexiglas® and rock materials.
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The point-load strength test for concrete cores
Magazine of Concrete Research, 1980Synopsis The point-load test, commonly used in geotechnical practice, is evaluated for application in concrete testing. The method uses portable equipment to test concrete cores which require no further preparation after removal from the structure.
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Estimation of strength anisotropy using the point-load test
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1983Abstract As most rocks are of an anisotropic nature, the measurement of the ratio between the maximum and minimum strength, i.e. the strength anisotropy, is of general interest. To measure the strength anisotropy by the uniaxial compression test, core specimens drilled in different directions are needed.
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The Five-Point Loading Shear Stiffness Test
The Journal of the Royal Aeronautical Society, 1962The shear stiffness of a beam in bending is commonly determined by measuring the central deflection δ in a three-point loading test for a range of values of the span L under a constant central load. The value of bending stiffness, EI, and shear stiffness, GA, can then be obtained by plotting δ/L against L2 and drawing the best straight line through the
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